By linking censuses through time or by combining other information with the census, many more important policy questions can be answered than if we used one dataset alone.

Today many donor-conceived children are adults and the impacts on their sense of identity have become clear, so Victoria is set to open the records of formerly anonymous donors.
Reuters/Kacper Pempel 8 décembre 2015

The Abbott government has announced 54 schools will receive funding for security guards and CCTV cameras in an attempt to prevent possible terror attacks. But where is the line between protection and privacy invasion?